Pin-tumbler lock.



P. F. AUGENBRAUN.

PIN TUMBLER LOCKl APPLIGATION FILED MAY 28, 1910.

Patented Aug. 2, 1910.

WITNESSE 'nenn'nnnnm or smi/troni), CONNECTICUT', .fissienon 'ro THEYALE e atanuracrnnrne COMPANY, or' savana-can, oonnnemcur.

Priv-Tuinman Loon.

l -Speciieation of Letters Patent.

Application filed May 28, 1910.' Serial No. 563,947,

fb all' 'li/hom- 'it' may concern:

Be 1t known that l, ln'rnn F. AUGEN- nnann, el Stamford, in the county of Fair-l improvement tumblers .carried by the plug, are out of alinement with the: tumbler holes in the 20 cylinder, consequently they cannot'be moved longitudinally by. the bit-tinge of the key,

and as the tumblers engage the bittings of the key, the latter is held against Withdravval. The. principal objection to this construction, particularly in the case of locks Whichare used frequently, is that the tumblers must have some play in their holes, and when a keyl is inserted and Withdrawn these tumblers are pushed iirst against one side and then against the other of the tumhier holes, which results ,in a Wear and distortion both on the tumblers',` and holes Which causes unsatisfactory action of the tumblers, and ultimately Wears out the lock altogether. Again, the abrasion of the key against the Walls of the key'Way, causes a Wearing .and enlargement oi" 'the latter which `also seriously interferes With the proper action of the lock and finally renders it Worthless.

' The object of the presentv (invention, is; therefore, to provide means for taking the' p strain, and consequent Wear, from` the` tumbler, tumbler holes and plug, and trans- -i'erring it to the cylinder and key, so that any pulling strain on thekey Will be transmitted directly to the cylinder.

A further object -is to provide means for limiting if so desired, the turning movement of the key and plug.

A further object is to provide means for preventing undue Wear upon the key Way,- by providing the plug With a steel faceplatehaving the key 10i Whuywnhin am, pe-

riphery of the plate. -A

With these and other objectsin View my invention consists inthe parts and combinations of parts as Willbe more fully explained and pointed'out in the claims.

ln the accompanying dra-Wings, Figure l is a view in longitudinal section of my iniproved lock. Fig.v 21 is a rear endview of same. VFig. 3 is a sectional view on the line .fn-@ lof Fig. .1. n. Fig. is a view of therear end or face plate. Figs, -5 and 6 are views of the retaining plates. Fig. 7 is a vievv'- of the plate for holding the' camJin place ,and Fig. 8 is a view of the cam..

rammed Aeg; [25, 11am.' 4

l represent-s the cylinder providedlwith a p,

cylindrical bore for the plu 2, and at its rear or inner endy with thelip, the latter being concentric With the boreiiiv the oylinv 'der and extending about halfA way .around the bore at the bottom.4 The cylinderi'salsoprovided with the holes or recesses arranged to aline with similar holes' in the keyfplu'g for the reception of thepin tumblers'which` latter are of the Well knownconstruction and are operated by the key in the usual manner. The plug 2 is cylindricalr in shape and is provided withA a key Way 4e .extending throughout its length, and is proyided adjacent its inner end with a peripheral groove 5 in which the semi-circular ring Ishaped plate '6 rests. This ring shape'plate snugly rests against the lip 3 on the cylinderll, and is prevented from outward displacement thereby,jand is restrained from turning or rotating on the plug 2 by the steel face plate` 7, the lower ed e of which forms an'albutment against W ich the ends ofthe curved retaining plate 6 bear, the steel faceplate being Secured to vthe cylinder byscr'ews'. The plug 2 is provided with an enlarged outer end or head which bears against the front or outer face of the cylinder, hence when the ring plate 6 is in place Within the groove 5 'in the plug, it acts as-a guidefor so s the plug in the turning. movement .of the latter and also prevents endwise movement of the plug in the cylinder.l The. plate 6 is provided on its inner, Aor concave edge,

1miY

With a shoulder 8 located adjacent the key way in the plug, When the latter is in its normal position, and in the path of Inovement of the key for `preventing the latter removing the. ring plate 6, and turning it over,.tlie. shoulder S will come on the opposite side of the key way, thus providing for either a right or left hand turning movement of the key, but in instances where the ykeyis tozmake a complete revolution, this shoulder would be dispensed with.

Located between plate 6, and the rear end of cylinder 1, and over the lip 3, is the thin steel retaining plate 9, curved in the arc o t' a circle concentric with the plug 2, and projecting into the retaining plate i for the passa e ofV the key 11, the. slot 10 being located in line with the key slot in the plug, so as to permit the key to rbe freely entered and withdrawn when the plug is in itsnormal position. The key 11 is provided on itslower edge with a slot 12 so located with relation to the retaining plate 9, that when the key is fully inserted, the slot in the key will be in linel with the plate 9, thus permitting the key and the plug to be turned. As the key is turned, the plate 9 enters the slot 12 in the key and takes all endwise strain on the key, and thus prevents wear on the tumblers and recesses for the latter, and

groove 5 in said plug. This also prevents any tendency to endwise movement of the plug due to pulling strains on the key.

-By means-of the two combined retaining lates' and 9, aILendwise movement of the ey and the plug are guarded against, so that no injurious Y upon the tumblers orth'e holes Jfor the latter,

' thus insuring a better and more positive acv. the cam and might be resorted to in ment of parts shown and described withouty departing from the spirit and scope of my.

tion of the lock and prolonging its life.

To provide against undue wear of the key way, the plug 2 is provided at its outer end with a' steel or other hard metal cap or face plate 13 which in the present instance isin the forni of a ferrule embracing and secured to the outer end of the plug 2. This *cap or face plate is provided with a key way 14 conforming in shape and size to the key way in the plu the key way in said cap or face plate, beingw olly within the periphery of the latter, instead of extending through the periphery of the head of the plug, as is the'casein the locks now in use.` By this arrangement the steel cap takesthe wear both at the sides and top and prevents wear and consequent enlargement of the key way in the softer metal of the plug.

The cam 15 is mounted on the inner end of key plug 2 and is secured thereto by the disk 16, the latter resting within a recess in by screws.

It is evident that many slight changes the relative arrange- 9, is provided with a slot 10 strains can be imposedsecured to the en d of the plug2 rims,aua

invent-ion hence I would-have it understood that I do not wish to confine myself to the exact construction and arrangement of parts shown and described, but,

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1Q In a pin tumbler lock, the combination with a cylinder and its plug, the latter hava'peripheral groove,.of a plug retaining plate removably secured to the rear face of the cylinder with its edge in the groove in the plug.

'2. In a pin tumbler lock, the ycombination with a cylinder having a rearwardly projecting curved lip, and a plug mounted to turn in said cylinder and provided with a peripheral groove, of a plug retaining plate supported against said lip with one edge resting-in t-he groove in the plug. 3. In a pin tumbler lock, the combination lwith a cylinder having a rearwardly projecting curvedl lip, and a plug mounted to turn in. said cylinder, the said plug havingl a peripheral groove, of a semi-circular retaining plate resting with its4 concave edge in said groove and its convex edge in contact with said' lip, and a'plate vremovably secured to the rear face of. said cylinder and forming an abutment for the ends of said retaining plate. 4

-4. In a pin tumbler lock, the combination with a cylinder and its plug the latter having a peripheral groove, of a plug retaining plate removably mounted against the rear face of the cylinder with one edge resting in a groove in the plug, the said plate having a shoulder to engage the key for preventing the rotation of the latter in one direction.

5. In a pin tumbler lock, the combination with a cylinder andl its plug, the latter having a peripheral groove, of a hard metal plate supported cylinder with one plug, and akey/having a slot to receive said retaining plate when the key is turned.

6. In a pin tumbler' lock,.the combination against the rear face of the edge inthe groove in the p `with a cylinder and its plug, the latter havis turned.

7. In a pin tumbler lock the combination l 0 with a cylinder having a projecting li-p at its rear end, and aplug mounted to turn in said cylinder, the said plug having a periphy eral groove, of two semi-circular retaining plates, one made of hard "metal and both located over the lip on the cylinder with their concave edges 1n the groove in the plug, the

hard metal plate having a slot for the pas.- 'sage of the key andthe other with a shoulder for preventing the key from rotating in,l

one direction, a key havingV a slot to receive said' hard metal retaining plate when the key is turned, and a' removable face lplate 5 secured to the rear fate of the cylinder and forming abutments for the ends of the retaining plates. 4

I8. A. key plug for pin tumbler locks having a hard'metal cap, the key slot1in the latterI being Wholly Within the periphery of l0 the cap. P

In testimony whereof, I have signed this s} )eciication /in the presence of two subscribing witnesses.

l PETER .F. AUGENBRAUN. Witnesses:

SCHUYLER MERBITT, WILLIAM P. MosELY. 

